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4th gear failing to engage.

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hairygit:
Try putting the lead/cap from number 4 onto number 1 and vice versa, if number 1 is still not right, it's not the lead! What condition are the H.T. caps in?

Warthog1959:
They seem in fair condition. It is the 3rd down pipe from the left. I swapped the HT lead with 2 and the fault didn't move. I actually took the plug out and tested it for a spark in 4 and the plug failed. So I replaced all the plugs at once. BUT after a run out the down pipe is still tepid. It does not feel like it is running on 3 though.

hairygit:
How does the offending cylinders new plug look compared to the others after a run?

Warthog1959:
I'll check it when I next get chance to go out. Are you thinking fuelling? We did adjust the needles recently as it was running rich.

hairygit:
Needles, fuel levels, partially blocked jet, just a case of going through it step by step and a process of elimination. I assume the valve clearances aren't too tight on the offending cylinder?

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